:root{--bg: #f4f7fb;--bg-accent: #eef3ff;--surface: #ffffff;--surface-muted: #f8faff;--text: #0f172a;--text-muted: #475569;--border: #dbe3ef;--border-strong: #c6d2e3;--primary: #6da2ec;--primary-strong: #5b93e6;--danger: #b42318;--danger-bg: #fef3f2;--shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);--shadow-md: 0 8px 20px rgba(15, 23, 42, .07);--shadow-lg: 0 24px 48px rgba(15, 23, 42, .08)}.app-shell{min-height:100vh;padding:18px;box-sizing:border-box;background:radial-gradient(circle at 15% -15%,#dbe8ff 0%,transparent 40%),radial-gradient(circle at 85% -30%,#e3f0ff 0%,transparent 45%),linear-gradient(180deg,var(--bg) 0%,#eff4fb 100%);font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;color:var(--text)}.top-nav{max-width:1440px;margin:0 auto 16px;border:1px solid var(--border);border-radius:14px;background:#ffffffe6;backdrop-filter:blur(8px);box-shadow:var(--shadow-md);padding:8px 18px;font-size:15px;font-weight:700;letter-spacing:.01em}.top-nav-logo{display:block;height:44px;width:auto;max-width:100%}.site-layout{max-width:1440px;margin:0 auto;display:grid;grid-template-columns:160px minmax(820px,1fr) 160px;align-items:start;gap:16px}.workspace{min-width:0}.app-window{border-radius:18px;border:1px solid var(--border);box-shadow:var(--shadow-lg);background:linear-gradient(180deg,#fff,#f9fbff);display:grid;grid-template-columns:1.08fr .92fr;gap:16px;padding:16px;height:76vh;min-height:76vh}.info-window{margin-top:16px;border-radius:18px;border:1px solid var(--border);box-shadow:var(--shadow-md);background:linear-gradient(180deg,#fff,#f9fbff);padding:16px}.content-section{margin-top:24px}.content-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.content-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:22px 24px;box-shadow:var(--shadow-sm)}.content-card-title{font-size:15px;font-weight:700;color:var(--text);margin:0 0 10px}.content-card-text{font-size:13.5px;color:var(--text-muted);line-height:1.7;margin:0 0 10px}.content-card-text:last-child{margin-bottom:0}.content-card-text code{font-family:JetBrains Mono,Menlo,Monaco,Courier New,monospace;font-size:12px;background:var(--bg-accent);border:1px solid var(--border);border-radius:4px;padding:1px 5px;color:var(--text)}.content-card-list{margin:0;padding-left:18px;display:flex;flex-direction:column;gap:6px}.content-card-list li{font-size:13.5px;color:var(--text-muted);line-height:1.5}.content-card-faq{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}.content-card-faq li{display:flex;flex-direction:column;gap:2px}.content-card-faq li strong{font-size:13px;color:var(--text)}.content-card-faq li span{font-size:13px;color:var(--text-muted);line-height:1.5}@media(max-width:820px){.content-grid{grid-template-columns:1fr}}.info-content{border-radius:12px;border:1px solid var(--border);background:var(--surface-muted);box-shadow:var(--shadow-sm);padding:16px 18px;color:var(--text-muted);font-size:14px;line-height:1.6}.info-content>p{margin:0 0 12px}.info-loading-note{padding:10px 12px;margin:0 0 14px!important;border-radius:10px;border:1px solid rgba(109,162,236,.4);background:#6da2ec14;color:var(--text);font-size:13px;line-height:1.55}.info-content-label{margin:16px 0 10px!important;font-size:12px;font-weight:700;color:var(--text);text-transform:uppercase;letter-spacing:.04em}.info-steps{margin:0;padding-left:22px;display:flex;flex-direction:column;gap:8px;color:var(--text-muted);font-size:14px;line-height:1.55}.info-steps li{padding-left:4px}.ad-rail{min-height:76vh}.pane{min-height:0;border-radius:14px;border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow-sm);overflow:hidden}.preview-pane{display:flex;flex-direction:column}.toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:8px;padding:12px;border-bottom:1px solid var(--border);background:var(--surface-muted)}.aqua-btn{border:1px solid var(--border);border-radius:10px;background:#fff;color:#1e293b;font-size:12px;font-weight:600;padding:7px 11px;min-width:36px;line-height:1;cursor:pointer;box-shadow:var(--shadow-sm);transition:all .14s ease}.aqua-btn:hover{border-color:var(--border-strong);background:#f8fbff;transform:translateY(-1px)}.aqua-btn:active{transform:translateY(0)}.aqua-btn.active{border-color:#b5cbff;background:#e8f0ff;color:var(--primary-strong)}.zoom-readout{margin-left:auto;font-size:12px;font-weight:600;color:var(--text-muted);padding:0 6px}.viewer-viewport{position:relative;flex:1;min-height:0;overflow:auto;padding:18px;background:linear-gradient(180deg,#f7faff,#edf3fb)}.viewer-content{margin:0 auto;position:relative}.pages-stack{display:flex;flex-direction:column;gap:24px;transform-origin:top left}.latex-page{width:816px;min-height:1056px;background:#fff;border-radius:10px;border:1px solid #d6dfec;box-shadow:0 20px 35px #0f172a1a;box-sizing:border-box;overflow:hidden}.latex-page.welcome-page{padding:56px;height:1056px;min-height:auto}.latex-page.pdf-page{padding:0}.pdf-page-img{width:100%;display:block}.welcome-wrapper{display:flex;justify-content:center}.welcome-title{margin:0 0 4px;font-size:28px;font-weight:800;color:var(--text)}.welcome-text{font-size:15px;line-height:1.7;color:var(--text);margin:0 0 20px}.welcome-text--short{margin-bottom:12px}@keyframes engine-loading-spin{to{transform:rotate(360deg)}}.engine-loading-spinner{flex-shrink:0;width:20px;height:20px;border:2px solid var(--border);border-top-color:var(--primary-strong);border-radius:50%;animation:engine-loading-spin .65s linear infinite}.engine-loading-spinner--large{width:28px;height:28px;border-width:3px}.engine-loading-callout{display:flex;flex-direction:column;gap:14px;margin:20px 0 0;padding:14px 16px;border-radius:12px;border:1px solid var(--border);background:var(--surface-muted);box-shadow:var(--shadow-sm)}.engine-loading-callout-top{display:flex;align-items:flex-start;gap:14px}.engine-load-progress{width:100%;height:8px;border-radius:999px;background:var(--border);overflow:hidden;box-sizing:border-box}.engine-load-progress-fill{height:100%;width:0%;border-radius:999px;background:linear-gradient(90deg,var(--primary) 0%,var(--primary-strong) 100%);transition:width .28s ease-out}.engine-loading-callout-text{display:flex;flex-direction:column;gap:6px;min-width:0}.engine-loading-callout-title{font-size:15px;font-weight:700;color:var(--text)}.engine-loading-callout-detail{font-size:13px;line-height:1.55;color:var(--text-muted)}.error-box{margin:16px;padding:10px 12px;border-radius:10px;border:1px solid #f7c8c3;background:var(--danger-bg);color:var(--danger);font-size:13px;box-shadow:var(--shadow-sm)}.editor-pane{display:flex;flex-direction:column;height:100%;min-height:0}.form-scroll{flex:1;overflow-y:auto;padding:6px 16px 16px}.form-section{padding:14px 0;border-bottom:1px solid var(--border)}.form-section:last-child{border-bottom:none}.form-heading{margin:0 0 10px;font-size:13px;font-weight:700;color:var(--text);text-transform:uppercase;letter-spacing:.04em}.form-sub-heading{margin:12px 0 6px;font-size:12px;font-weight:600;color:var(--text-muted)}.segment-group{display:flex;gap:0;border:1px solid var(--border);border-radius:10px;overflow:hidden;background:var(--surface-muted)}.segment-btn{flex:1;padding:8px 10px;font-size:13px;font-weight:600;color:var(--text-muted);background:transparent;border:none;border-right:1px solid var(--border);cursor:pointer;transition:all .14s ease}.segment-btn:last-child{border-right:none}.segment-btn:hover{background:#f0f5ff;color:var(--text)}.segment-btn.active{background:var(--primary);color:#fff}.form-label{display:flex;flex-direction:column;gap:5px;font-size:12px;font-weight:600;color:var(--text-muted);margin-top:10px}.form-label.compact{max-width:180px}.form-row{display:flex;gap:12px;align-items:flex-end}.form-input,.form-select{padding:9px 11px;font-size:13px;border:1px solid var(--border);border-radius:9px;background:var(--surface);color:var(--text);outline:none;transition:border-color .14s ease;font-family:inherit}.form-input:focus,.form-select:focus{border-color:var(--primary);box-shadow:0 0 0 3px #6da2ec2e}.form-input::placeholder{color:#94a3b8}.form-select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg width='10' height='6' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%2394a3b8'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center;padding-right:28px}.form-textarea{padding:9px 11px;font-size:13px;font-family:inherit;border:1px solid var(--border);border-radius:9px;background:var(--surface);color:var(--text);outline:none;resize:vertical;min-height:64px;transition:border-color .14s ease}.form-textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px #6da2ec2e}.form-textarea::placeholder{color:#94a3b8}.checkbox-group{display:flex;flex-wrap:wrap;gap:6px 14px}.checkbox-label,.toggle-row{display:flex;align-items:center;gap:7px;font-size:13px;color:var(--text);cursor:pointer;padding:4px 0}.checkbox-label input[type=checkbox],.toggle-row input[type=checkbox]{width:16px;height:16px;border-radius:4px;accent-color:var(--primary);cursor:pointer}.toggle-group{display:flex;flex-direction:column}.advanced-toggle{display:flex;align-items:center;justify-content:space-between;width:100%;padding:0;margin:0;font-size:13px;font-weight:700;color:var(--text-muted);background:none;border:none;cursor:pointer;text-transform:uppercase;letter-spacing:.04em}.advanced-toggle:hover{color:var(--text)}.toggle-chevron{font-size:11px;transition:transform .2s ease}.toggle-chevron.open{transform:rotate(180deg)}.advanced-content{padding-top:10px}.prompt-preview{position:relative;margin-top:10px;border:1px solid var(--border);border-radius:9px;background:#f8fafc;padding:12px;max-height:200px;overflow-y:auto}.prompt-text{margin:0;font-size:11px;line-height:1.5;color:var(--text-muted);white-space:pre-wrap;word-break:break-word;font-family:JetBrains Mono,Menlo,Monaco,Courier New,monospace}.copy-btn{position:absolute;top:8px;right:8px;font-size:11px;font-weight:600;padding:4px 10px;border:1px solid var(--border);border-radius:6px;background:var(--surface);color:var(--text-muted);cursor:pointer;transition:all .14s ease}.copy-btn:hover{border-color:var(--border-strong);color:var(--text)}.editor-actions{display:flex;flex-wrap:wrap;gap:8px;padding:12px 14px 14px;border-top:1px solid var(--border);background:var(--surface-muted)}.editor-actions .quota-hint{width:100%;margin:0;font-size:12px;line-height:1.35;color:var(--text-muted)}.preview-btn{border:1px solid transparent;border-radius:10px;background:linear-gradient(180deg,var(--primary) 0%,var(--primary-strong) 100%);color:#fff;font-size:13px;font-weight:600;padding:8px 14px;cursor:pointer;box-shadow:0 6px 14px #6da2ec59;transition:all .14s ease}.preview-btn:hover{filter:brightness(1.05);transform:translateY(-1px)}.preview-btn:active{transform:translateY(0)}.generate-btn:disabled{opacity:.55;cursor:not-allowed}.generate-btn--engine-loading{display:inline-flex;align-items:center;justify-content:center;gap:8px}.engine-loading-spinner--inline{width:15px;height:15px;border-width:2px;border-color:#ffffff59;border-top-color:#fff}.download-btn{background:#fff;color:#1e293b;border-color:var(--border);box-shadow:var(--shadow-sm)}.download-btn:disabled{opacity:.55;cursor:not-allowed}@media(max-width:1200px){.site-layout{grid-template-columns:minmax(0,1fr)}.ad-rail{min-height:0}}@media(max-width:920px){.app-shell{padding:10px}.top-nav{margin-bottom:10px}.app-window{grid-template-columns:1fr;grid-template-rows:auto auto;height:auto;min-height:auto}.preview-pane{min-height:56vh}.editor-pane{min-height:40vh}.zoom-readout{margin-left:0;width:100%}}.top-nav{display:flex;align-items:center;justify-content:space-between}.nav-logo-btn{background:none;border:none;padding:0;cursor:pointer;display:flex;align-items:center}.top-nav-links{display:flex;gap:4px}.nav-link{background:none;border:none;padding:6px 12px;font-size:13px;font-weight:600;color:var(--text-muted);cursor:pointer;border-radius:8px;transition:all .14s ease;font-family:inherit}.nav-link:hover{color:var(--text);background:#6da2ec1a}.site-footer{max-width:1440px;margin:24px auto 0;padding:16px 18px;border-top:1px solid var(--border)}.footer-inner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}.footer-brand{font-size:13px;color:var(--text-muted);font-weight:500}.footer-links{display:flex;gap:4px;flex-wrap:wrap}.footer-link{background:none;border:none;padding:4px 10px;font-size:13px;color:var(--text-muted);cursor:pointer;border-radius:6px;transition:all .14s ease;font-family:inherit}.footer-link:hover{color:var(--primary);background:#6da2ec14}.legal-page{max-width:760px;margin:32px auto 64px;padding:40px 48px;background:var(--surface);border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow-md);line-height:1.75;color:var(--text)}.legal-page h1{font-size:26px;font-weight:800;margin:0 0 8px;color:var(--text)}.legal-page h2{font-size:16px;font-weight:700;margin:28px 0 8px;color:var(--text)}.legal-page p{margin:0 0 14px;font-size:14px;color:var(--text-muted)}.legal-page ul{margin:0 0 14px;padding-left:22px}.legal-page li{font-size:14px;color:var(--text-muted);margin-bottom:6px}.legal-page a{color:var(--primary);text-decoration:underline}.legal-page a:hover{color:var(--primary-strong)}.inline-link{background:none;border:none;padding:0;font-size:inherit;color:var(--primary);text-decoration:underline;cursor:pointer;font-family:inherit}.inline-link:hover{color:var(--primary-strong)}@media(max-width:600px){.legal-page{padding:24px 20px;margin:16px 0 40px;border-radius:12px}.footer-inner{flex-direction:column;align-items:flex-start}}